Synchronous scan streaking device

Abstract

A synchronous scan streaking device comprising a photoelectric layer, an electronic lens, an anode with an aperture, a pair of deflection electrodes, and a phosphor layer arranged in order within a vacuum envelope. A deflection voltage at the same frequency as the repetition rate of the light pulses incident on the phosphor layer to be measured is fed from deflection voltage generation means to the deflection electrodes so as to repetitively generate an enhanced image of the incident light on the phosphor layer. At least one shielding metal structure which is connected to the common potential source is arranged in the space between the deflection electrode plate and the wall of the envelope, and surrounding a deflection electrode plate lead provided to connect the deflection electrode plate through the envelope to the deflection voltage generation means.

What is claimed is: 
     
       1. A synchronous scan streaking device for receiving light pulses having a given repetition rate and generating a streaking image corresponding to said light pulses, comprising an evacuated envelope having an outer wall and a longitudinal axis;   a plurality of elements including a photoelectric layer, an electronic lens, an anode having an aperture therein, first and second deflection electrodes having a given length along the longitudinal axis of said envelope, and a phosphor layer, all of said elements being arranged sequentially along the longitudinal axis of said evacuated envelope, said photoelectric layer receiving said light pulses and emitting photoelectrons corresponding to the intensity of the incident light;   deflection voltage generator means for generating a deflection voltage having the same frequency as the repetition rate of said light pulses;   a first deflection electrode plate lead connecting said deflection voltage generator to said first deflection electrode, said lead passing through the outer wall of said envelope; and   at least one shielding metal structure arranged in the space between said first deflection electrode and the outer wall of said envelope, said shielding metal structure surrounding said first deflection electrode plate lead, whereby an enhanced image of the light pulses incident on said photoelectric layer is generated on said phosphor layer.   
     
     
       2. A synchronous scan streaking device as claimed in claim 10, wherein said second deflection electrode is connected to a common potential source through a second deflection electrode plate lead. 
     
     
       3. A synchronous scan streaking device as claimed in claim 2, wherein said shielding metal structure is located adjacent said anode electrode. 
     
     
       4. A synchronous scan streaking device as claimed in claim 14, wherein said first and second shielding plates are a pair of shielding grids. 
     
     
       5. A synchronous scan streaking device as claimed in claim 2, wherein said shielding metal structure consists of a metal cylinder enclosing said first deflection electrode lead, said metal cylinder being connected to said common potential source. 
     
     
       6. A synchronous scan streaking device as claimed in claim 5, wherein said metal cylinder includes a bottom conductor having an aperture through which said first deflection electrode plate lead passes. 
     
     
       7. The synchronous scan streaking device as claimed in claim 5, wherein a flange is provided at the bottom of said metal cylinder so that said flange covers said first deflection electrode. 
     
     
       8. A synchronous scan streaking device as claimed in claim 1 wherein said at least one shielding metal structure includes a shielding plate having a surface which is perpendicular to the longitudinal axis of said envelope, the plane defined by said surface intersecting said deflection electrodes. 
     
     
       9. A synchronous scan streaking device as claimed in claim 8 which comprises two spaced shielding metal structures each including a shielding plate having a surface which is perpendicular to the longitudinal axis of said envelope, the planes defined by said surfaces intersecting said deflection electrodes. 
     
     
       10. A synchronous scan streaking device as claimed in claim 3, wherein said shielding metal structure comprises a first flange having an aperture therein, said first flange being fastened to said envelope and being located in the space between said first deflection electrode plate lead and said anode electrode; and   a second flange, having an aperture therein, said second flange being fastened to said envelope and being located on the side of said deflection electrode plate lead opposite the side on which said first flange is located, said first and second flanges being connected to said common potential source.   
     
     
       11. A synchronous scan streaking device as claimed in claim 10, wherein said shielding metal structure includes first and second shielding plates affixed to said first and second flanges, said first and second shielding plates isolating said first deflection electrode plate lead from the other elements located within said envelope.